"When I work with these non-profit organizations, you go on the ground, you see what's happening," he told Ellen, describing a trip to Nepal to look for tigers while riding an elephant. "And then I went scuba diving looking for sharks. And I had a huge fear of sharks. And when I did "Blood Diamond" in 2006, I actually got stuck in a cage with a great white - which was awesome."

DiCaprio continued: "They actually said (that) in 30 years, this has never happened. But the tuna kind of got stuck on the top of the cage, and the great white kind of leapt out and tried to bite it, and it went into the cage with me and half its body was in and out, and I flattened down at the bottom and it chomped a few times. It was absolutely terrifying."

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of MNN.com. While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.